linux/fs/configfs
Mike Christie cc57c07343 configfs: fix registered group removal
This patch fixes a bug where configfs_register_group had added
a group in a tree, and userspace has done a rmdir on a dir somewhere
above that group and we hit a kernel crash. The problem is configfs_rmdir
will detach everything under it and unlink groups on the default_groups
list. It will not unlink groups added with configfs_register_group so when
configfs_unregister_group is called to drop its references to the group/items
we crash when we try to access the freed dentrys.

The patch just adds a check for if a rmdir has been done above
us and if so just does the unlink part of unregistration.

Sorry if you are getting this multiple times. I thouhgt I sent
this to some of you and lkml, but I do not see it.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2018-07-17 06:14:07 -07:00
..
configfs_internal.h configfs: implement binary attributes 2016-01-04 12:31:46 +01:00
dir.c configfs: fix registered group removal 2018-07-17 06:14:07 -07:00
file.c configfs: Fix bool initialization/comparison 2017-10-19 16:15:14 +02:00
inode.c vfs: change inode times to use struct timespec64 2018-06-05 16:57:31 -07:00
item.c configfs: use kvasprintf() instead of open-coding it 2018-06-19 07:08:12 +02:00
Kconfig configfs: change depends -> select SYSFS 2011-01-16 21:22:29 +00:00
Makefile
mount.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
symlink.c configfs: replace strncpy with memcpy 2018-07-02 07:12:55 -06:00